1.
A={1,2,3,4}A = \{1, 2, 3, 4\}, B={1,2,3,4,5,6}B = \{1, 2, 3, 4, 5, 6\} are two sets, and function f:ABf : A \to B is defined by f(x)=x+2f(x) = x + 2 xA\forall x \in A, then the function ff is